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Abstract <p>The influence of large scale vortices (LSVs) in the incoming flow on the flow and characteristics of a model subsonic air intake (AI) has been studied using a modified RANS/ILES(i) method with a reduced level of numerical viscosity. For comparison, calculations are performed with an undisturbed external flow. The parameters of the external flow correspond to the takeoff mode and are calculated at an angle of attack of 5°. The influence of LSVs the incoming flow on the instantaneous and averaged flow and turbulence parameters inside the air intake channel and in its outlet section is revealed. It is established that the presence of LSVs has a weak effect on the averaged flow parameters of the AI outlet section, but leads to a significant increase in the pulsations of the total pressure in this section.</p>

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Simulation by the RANS/ILES(I) Method of Subsonic Air Intake Operation in an Incoming Flow with Large-Scale Vortices

  • 期刊论文

  • 发表日期：

    2026年2月1日

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  • A. S. Zhigalkin,
  • D. A. Lyubimov

摘要

Abstract

The influence of large scale vortices (LSVs) in the incoming flow on the flow and characteristics of a model subsonic air intake (AI) has been studied using a modified RANS/ILES(i) method with a reduced level of numerical viscosity. For comparison, calculations are performed with an undisturbed external flow. The parameters of the external flow correspond to the takeoff mode and are calculated at an angle of attack of 5°. The influence of LSVs the incoming flow on the instantaneous and averaged flow and turbulence parameters inside the air intake channel and in its outlet section is revealed. It is established that the presence of LSVs has a weak effect on the averaged flow parameters of the AI outlet section, but leads to a significant increase in the pulsations of the total pressure in this section.